Cast Lead Thread ?

[Jhon]

I found the checks too tricky to seat afterwards so I just stick em on at initial sizing. I do dust the pc off with a bit of paper towel as I want the bases as flat as possible. Doesn't look totally perfect but they fly well and true

Why do both? GC and PC?

[shooternz]

Why do both? GC and PC?

The Gas Check reinforces the base when using high velocity loads also there is an improvement in accuracy when gas checking a bullet
lhat is designed for them, and the bullets can be made from softer lead for expansion, Powder coating is modern Paper Patching.

[Marty Henry]

Powder coating is modern Paper Patching.

Thanks @shooternz At last I understand powder coating and how it works.I'm now going to give up the fiddling with cut bits of paper for that goes on for a few guns.

[akaroa1]

Thanks @shooternz At last I understand powder coating and how it works.I'm now going to give up the fiddling with cut bits of paper for that goes on for a few guns.

@Marty Henry do you want me to send you some .309 and/ or .311 to try ?

Guaranteed not to wreck your barrels
I have just found a load that my 500 3" BPE is happy with. 450 grain PC bullets 3 shots going into a raged single hole at 50m

[T.FOYE]

Why do both? GC and PC?

They seat better I find and they also seem to keep the bore cleaner at high speed. But I don't reckon the blast melts the bases. Not from the unchecked bullets I've recovered from the dirt anyway.